Record the type of commit operation in the reflog.

If committing a merge (.git/MERGE_HEAD exists), an initial tree
(no HEAD) or using --amend to amend the prior commit then denote
the subtype of commit in the reflog.  This helps to distinguish
amended or merge commits from normal commits.

In the case of --amend the prior sha1 is probably the commit which
is being thrown away in favor of the new commit.  Since it is likely
that the old commit doesn't have any ref pointing to it anymore
it can be interesting to know why that the commit was replaced
and orphaned.

In the case of a merge the prior sha1 is probably the first parent
of the new merge commit.  Consequently having its prior sha1 in the
reflog is slightly less interesting but its still informative to
know the commit was the result of a merge which had to be completed
by hand.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/git-commit.sh b/git-commit.sh
index 351d13cb1ef3ad62e410f60e07112afdaaa95094..802dd7243e233b7be773154311c3d8791fc7d610 100755 (executable)
--- a/git-commit.sh
+++ b/git-commit.sh
@@ -635,9 +635,12 @@ fi
 PARENTS="-p HEAD"
 if test -z "$initial_commit"
 then
+       rloga='commit'
        if [ -f "$GIT_DIR/MERGE_HEAD" ]; then
+               rloga='commit (merge)'
                PARENTS="-p HEAD "`sed -e 's/^/-p /' "$GIT_DIR/MERGE_HEAD"`
        elif test -n "$amend"; then
+               rloga='commit (amend)'
                PARENTS=$(git-cat-file commit HEAD |
                        sed -n -e '/^$/q' -e 's/^parent /-p /p')
        fi
@@ -649,6 +652,7 @@ else
        fi
        PARENTS=""
        current=
+       rloga='commit (initial)'
 fi
 
 if test -z "$no_edit"
@@ -724,7 +728,7 @@ then
        fi &&
        commit=$(cat "$GIT_DIR"/COMMIT_MSG | git-commit-tree $tree $PARENTS) &&
        rlogm=$(sed -e 1q "$GIT_DIR"/COMMIT_MSG) &&
-       git-update-ref -m "commit: $rlogm" HEAD $commit $current &&
+       git-update-ref -m "$rloga: $rlogm" HEAD $commit $current &&
        rm -f -- "$GIT_DIR/MERGE_HEAD" &&
        if test -f "$NEXT_INDEX"
        then

diff --git a/t/t1400-update-ref.sh b/t/t1400-update-ref.sh
index df3e9933658595c2690d4b83e3d5adb2289b887f..6a3515dd711f2f5cdf2e6d0f32d7b2897908b399 100755 (executable)
--- a/t/t1400-update-ref.sh
+++ b/t/t1400-update-ref.sh
@@ -188,17 +188,30 @@ test_expect_success \
         echo OTHER >F &&
         GIT_AUTHOR_DATE="2005-05-26 23:41" \
         GIT_COMMITTER_DATE="2005-05-26 23:41" git-commit -F M -a &&
-        h_OTHER=$(git-rev-parse --verify HEAD)
+        h_OTHER=$(git-rev-parse --verify HEAD) &&
+        echo FIXED >F &&
+        EDITOR=true \
+        GIT_AUTHOR_DATE="2005-05-26 23:44" \
+        GIT_COMMITTER_DATE="2005-05-26 23:44" git-commit --amend &&
+        h_FIXED=$(git-rev-parse --verify HEAD) &&
+        echo TEST+FIXED >F &&
+        echo Merged initial commit and a later commit. >M &&
+        echo $h_TEST >.git/MERGE_HEAD &&
+        GIT_AUTHOR_DATE="2005-05-26 23:45" \
+        GIT_COMMITTER_DATE="2005-05-26 23:45" git-commit -F M &&
+        h_MERGED=$(git-rev-parse --verify HEAD)
         rm -f M'
 
 cat >expect <<EOF
-$Z $h_TEST $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150200 +0000 commit: add
+$Z $h_TEST $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150200 +0000 commit (initial): add
 $h_TEST $h_OTHER $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150860 +0000   commit: The other day this did not work.
+$h_OTHER $h_FIXED $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117151040 +0000  commit (amend): The other day this did not work.
+$h_FIXED $h_MERGED $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117151100 +0000 commit (merge): Merged initial commit and a later commit.
 EOF
 test_expect_success \
        'git-commit logged updates' \
        'diff expect .git/logs/$m'
-unset h_TEST h_OTHER
+unset h_TEST h_OTHER h_FIXED h_MERGED
 
 test_expect_success \
        'git-cat-file blob master:F (expect OTHER)' \